hi,
i am using the debian linux and am working on the 2.6.6 kernel.
i want to access the tcp header, modify it (by passing it through my function) and then
put it back for the regular flow to continue.
can somebody tell me where i can access TCP header....
this is what i think is right

1.will using (struct sk_buff*)skb->h.th be sufficient
2.using hook to divert the regular flow.
3.passing it to my function.
4.putting it back.

am i right???

the other question is i tried writing a small module with the init and exit
fucntions for the module. It complies correctly...but when i do a

insmod module.o....i get an error saying -1 invalid module format.

Is this because the module is not complied as module.ko???

thanx in advance,

i think just use a raw socket
SOCK_RAW
and forget the kernel altogether

If i am writing my own program in the user space then it can think of using the raw sockets.
what i am looking at is ......

all TCP packets(from http application etc) passing through the transport layer are to be tracked in the stack. My modified header is to be added to it instead of the regular header and only then the packet flows down the stack.

raw sockets may not be relevant here...may be i have to pass through the kernel...
hope you can suggest something else....
thanx